UPDATE:
I tried cleaning the sensors before taking it to the dealer but it still didnt work. When I finally went to my dealer, thwy were able to fix the issue as a faulty sensor and replaced it. Everything seems to be working perfectly now.
When I shift into reverse, my Ioniq dash displays a warning that the parking sensors are not working. Could cleaning the sensors help, or is something else wrong? I've already tried resetting the car, but the warning is still there.